Thermodynamic and electrical transport properties of 
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 under uniaxial stress

Girod, Clément; Stevens, C.; Huxley, A.; Bauer, E. D.; Santos, Flávia Borges; Thompson, J. D.; Fernandes, Rafael M.; Zhu, Jian‐Xin; Ronning, F.; Rosa, P. F. S.; Thomas, S. M.

doi:10.1103/physrevb.106.l121101

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…This state has point nodes close to the b and c axes, which may not be sensitively detected by the a -axis thermal conductivity. However, such a state can be safely ruled out because the double superconducting transitions, required for such a multicomponent state ( 46 ), have never been observed in clean UTe 2 crystals ( 18 – 20 ), even in the presence of uniaxial strain ( 21 ).…”

Section: Discussionmentioning

confidence: 99%

“…At an early stage, a chiral superconducting state with a multicomponent order parameter has been suggested by the double peak of the specific heat and polar Kerr effect ( 16 ), which was supported by scanning tunneling spectroscopy experiments ( 17 ). However, as the sample quality improves, a single peak is observed in the specific heat ( 18 – 20 ) and does not split into two peaks even under uniaxial strain ( 21 ). Moreover, recent Kerr effect experiments on clean crystals report no evidence of broken time-reversal symmetry ( 22 ).…”

Section: Introductionmentioning

confidence: 99%

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Fully gapped pairing state in spin-triplet superconductor UTe ₂

Suetsugu,

Shimomura,

Kamimura

et al. 2024

Sci. Adv.

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The recently discovered superconductor UTe 2 is a promising candidate for spin-triplet superconductors, but the symmetry of the superconducting order parameter remains highly controversial. Here, we determine the superconducting gap structure by the thermal conductivity of ultraclean UTe 2 single crystals. We find that the a -axis thermal conductivity divided by temperature κ/ T in zero-temperature limit is vanishingly small for both magnetic field H ‖ a and H ‖ c axes up to H / H c 2 ∼ 0.2, demonstrating the absence of nodes around the a axis contrary to the previous belief. The present results, combined with the reduction of nuclear magnetic resonance Knight shift, indicate that the superconducting order parameter belongs to the isotropic A u representation with a fully gapped pairing state, analogous to the B phase of superfluid 3 He. These findings reveal that UTe 2 is likely to be a long-sought three-dimensional strong topological superconductor, hosting helical Majorana surface states on any crystal plane.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fully gapped pairing state in spin-triplet superconductor UTe ₂

Suetsugu,

Shimomura,

Kamimura

et al. 2024

Sci. Adv.

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“…The Kerr effect indicating TRSB has been observed [75]. However, a second heat capacity jump is only observed under hydrostatic pressure [42,76] while no second jump is seen under applied stress [77]. It is hypothesized that the presence or absence of the second jump may be affected by sample quality [78].…”

Section: Other Time-reversal Symmetry Broken Superconductorsmentioning

confidence: 99%

Heat capacity double transitions in time-reversal symmetry broken superconductors

Røising

Wagner²,

Roig³

et al. 2022

Phys. Rev. B

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Standard superconductors display a ubiquitous discontinuous jump in the electronic specific heat at the critical superconducting transition temperature. In a growing class of unconventional superconductors, however, a second order parameter component may get stabilized and produce a second heat capacity jump at a lower temperature, typically associated with the spontaneous breaking of time-reversal symmetry. The splitting of the two specific heat discontinuities can be controlled by external perturbations such as chemical substitution, hydrostatic pressure, or uniaxial strain. We develop a theoretical quantitative multiband framework to determine the ratio of the heat capacity jumps, given the band structure and the order parameter momentum structure. We discuss the conditions of the gap profile which determine the amplitude of the second jump. We apply our formalism to the case of Sr 2 RuO 4 , and using the gap functions from a microscopic random phase approximation calculation, we show that recently proposed accidentally degenerate order parameters may exhibit a strongly suppressed second heat capacity jump. We discuss the origin of this result and consider also the role of spatial inhomogeneity on the specific heat. Our results provide a possible explanation of why a second heat capacity jump has so far evaded experimental detection in Sr 2 RuO 4 .

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“…If the interpretation of [10] is correct, then a B 1g -like strain should be able to further split two nearly degenerate superconducting transitions. By applying such a strain and finding no noticeable split in the superconducting transition observed in heat capacity, Hayes et al showed that either the choices of order parameter from [10] are incorrect or the coupling between strain and the superconducting order parameters must be small [118].…”

Section: Recent Developmentsmentioning

confidence: 99%

A review of UTe₂at high magnetic fields

Lewin,

Frank,

Ran

et al. 2023

Rep. Prog. Phys.

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Uranium ditelluride (UTe2) is recognized as a host material to unconventional spin-triplet superconductivity, but it also exhibits a wealth of additional unusual behavior at high magnetic fields. One of the most prominent signatures of the unconventional superconductivity is a large and anisotropic upper critical field that exceeds the paramagnetic limit. This superconductivity survives to 35 T and is bounded by a discontinuous magnetic transition, which itself is also fielddirection-dependent. A different, reentrant superconducting phase emerges only on the high-field side of the magnetic transition, in a range of angles between the crystallographic b and c axes. This review discusses the current state of knowledge of these high-field phases, the high-field behavior of the heavy fermion normal state, and other phases that are stabilized by applied pressure.

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Thermodynamic and electrical transport properties of UTe2 under uniaxial stress

Cited by 11 publications

References 35 publications

Fully gapped pairing state in spin-triplet superconductor UTe ₂

Fully gapped pairing state in spin-triplet superconductor UTe ₂

Heat capacity double transitions in time-reversal symmetry broken superconductors

A review of UTe₂at high magnetic fields

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Thermodynamic and electrical transport properties of UTe2 under uniaxial stress

Cited by 11 publications

References 35 publications

Fully gapped pairing state in spin-triplet superconductor UTe 2

Fully gapped pairing state in spin-triplet superconductor UTe 2

Heat capacity double transitions in time-reversal symmetry broken superconductors

A review of UTe2at high magnetic fields

Contact Info

Product

Resources

About

Fully gapped pairing state in spin-triplet superconductor UTe ₂

Fully gapped pairing state in spin-triplet superconductor UTe ₂

A review of UTe₂at high magnetic fields